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One additional consideration is that the 328 comes with halogens while the 428 comes with xenons standard. However, I believe the 2013 E92 (coupe) also came with halogens. Even when adjusted, the GC now makes up the traditional price difference between the 3 series sedan and its coupe(like) counter-part.

The price difference between the 3 series sedan and a more clearly defined 4 coupe now averages just over $2400 (with ZLP adjustments for the 328). Compared to 2013 where the average was $1900, BMW is now asking $500 more upfront on base models alone. Marketing win!

Interestingly, most over-estimated the base price premium between the 3/4 series as being in the $4k+ territory!

You forgot 4ers come standard with the sport automatic transmission which is a $500 option on the 3er.

True, but I put this one in somewhat of a grey area as you need a sport / M-sport line for the option to even become available. I'd need to up the 4 series prices to a sport / M-sport line also and didn't want to muddy the water too much with all the different lines.

Simplistically, you could just take $500 off from the MSRP of the 4 series, however if BMW chose not to make the sport transmission standard, I think they would still be keeping some of that price difference on the base sticker.

I suspect the next generation of 3/4 series will become further differentiated.

One additional consideration is that the 328 comes with halogens while the 428 comes with xenons standard. However, I believe the 2013 E92 (coupe) also came with halogens. Even when adjusted, the GC now makes up the traditional price difference between the 3 series sedan and its coupe(like) counter-part.